MIPS: Enable heap randomization.
[sfrench/cifs-2.6.git] / arch / mips / include / asm / elf.h
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Much of this is taken from binutils and GNU libc ...
7  */
8 #ifndef _ASM_ELF_H
9 #define _ASM_ELF_H
10
11
12 /* ELF header e_flags defines. */
13 /* MIPS architecture level. */
14 #define EF_MIPS_ARCH_1          0x00000000      /* -mips1 code.  */
15 #define EF_MIPS_ARCH_2          0x10000000      /* -mips2 code.  */
16 #define EF_MIPS_ARCH_3          0x20000000      /* -mips3 code.  */
17 #define EF_MIPS_ARCH_4          0x30000000      /* -mips4 code.  */
18 #define EF_MIPS_ARCH_5          0x40000000      /* -mips5 code.  */
19 #define EF_MIPS_ARCH_32         0x50000000      /* MIPS32 code.  */
20 #define EF_MIPS_ARCH_64         0x60000000      /* MIPS64 code.  */
21 #define EF_MIPS_ARCH_32R2       0x70000000      /* MIPS32 R2 code.  */
22 #define EF_MIPS_ARCH_64R2       0x80000000      /* MIPS64 R2 code.  */
23
24 /* The ABI of a file. */
25 #define EF_MIPS_ABI_O32         0x00001000      /* O32 ABI.  */
26 #define EF_MIPS_ABI_O64         0x00002000      /* O32 extended for 64 bit.  */
27
28 #define PT_MIPS_REGINFO         0x70000000
29 #define PT_MIPS_RTPROC          0x70000001
30 #define PT_MIPS_OPTIONS         0x70000002
31
32 /* Flags in the e_flags field of the header */
33 #define EF_MIPS_NOREORDER       0x00000001
34 #define EF_MIPS_PIC             0x00000002
35 #define EF_MIPS_CPIC            0x00000004
36 #define EF_MIPS_ABI2            0x00000020
37 #define EF_MIPS_OPTIONS_FIRST   0x00000080
38 #define EF_MIPS_32BITMODE       0x00000100
39 #define EF_MIPS_ABI             0x0000f000
40 #define EF_MIPS_ARCH            0xf0000000
41
42 #define DT_MIPS_RLD_VERSION     0x70000001
43 #define DT_MIPS_TIME_STAMP      0x70000002
44 #define DT_MIPS_ICHECKSUM       0x70000003
45 #define DT_MIPS_IVERSION        0x70000004
46 #define DT_MIPS_FLAGS           0x70000005
47         #define RHF_NONE        0x00000000
48         #define RHF_HARDWAY     0x00000001
49         #define RHF_NOTPOT      0x00000002
50         #define RHF_SGI_ONLY    0x00000010
51 #define DT_MIPS_BASE_ADDRESS    0x70000006
52 #define DT_MIPS_CONFLICT        0x70000008
53 #define DT_MIPS_LIBLIST         0x70000009
54 #define DT_MIPS_LOCAL_GOTNO     0x7000000a
55 #define DT_MIPS_CONFLICTNO      0x7000000b
56 #define DT_MIPS_LIBLISTNO       0x70000010
57 #define DT_MIPS_SYMTABNO        0x70000011
58 #define DT_MIPS_UNREFEXTNO      0x70000012
59 #define DT_MIPS_GOTSYM          0x70000013
60 #define DT_MIPS_HIPAGENO        0x70000014
61 #define DT_MIPS_RLD_MAP         0x70000016
62
63 #define R_MIPS_NONE             0
64 #define R_MIPS_16               1
65 #define R_MIPS_32               2
66 #define R_MIPS_REL32            3
67 #define R_MIPS_26               4
68 #define R_MIPS_HI16             5
69 #define R_MIPS_LO16             6
70 #define R_MIPS_GPREL16          7
71 #define R_MIPS_LITERAL          8
72 #define R_MIPS_GOT16            9
73 #define R_MIPS_PC16             10
74 #define R_MIPS_CALL16           11
75 #define R_MIPS_GPREL32          12
76 /* The remaining relocs are defined on Irix, although they are not
77    in the MIPS ELF ABI.  */
78 #define R_MIPS_UNUSED1          13
79 #define R_MIPS_UNUSED2          14
80 #define R_MIPS_UNUSED3          15
81 #define R_MIPS_SHIFT5           16
82 #define R_MIPS_SHIFT6           17
83 #define R_MIPS_64               18
84 #define R_MIPS_GOT_DISP         19
85 #define R_MIPS_GOT_PAGE         20
86 #define R_MIPS_GOT_OFST         21
87 /*
88  * The following two relocation types are specified in the MIPS ABI
89  * conformance guide version 1.2 but not yet in the psABI.
90  */
91 #define R_MIPS_GOTHI16          22
92 #define R_MIPS_GOTLO16          23
93 #define R_MIPS_SUB              24
94 #define R_MIPS_INSERT_A         25
95 #define R_MIPS_INSERT_B         26
96 #define R_MIPS_DELETE           27
97 #define R_MIPS_HIGHER           28
98 #define R_MIPS_HIGHEST          29
99 /*
100  * The following two relocation types are specified in the MIPS ABI
101  * conformance guide version 1.2 but not yet in the psABI.
102  */
103 #define R_MIPS_CALLHI16         30
104 #define R_MIPS_CALLLO16         31
105 /*
106  * This range is reserved for vendor specific relocations.
107  */
108 #define R_MIPS_LOVENDOR         100
109 #define R_MIPS_HIVENDOR         127
110
111 #define SHN_MIPS_ACCOMON        0xff00          /* Allocated common symbols */
112 #define SHN_MIPS_TEXT           0xff01          /* Allocated test symbols.  */
113 #define SHN_MIPS_DATA           0xff02          /* Allocated data symbols.  */
114 #define SHN_MIPS_SCOMMON        0xff03          /* Small common symbols */
115 #define SHN_MIPS_SUNDEFINED     0xff04          /* Small undefined symbols */
116
117 #define SHT_MIPS_LIST           0x70000000
118 #define SHT_MIPS_CONFLICT       0x70000002
119 #define SHT_MIPS_GPTAB          0x70000003
120 #define SHT_MIPS_UCODE          0x70000004
121 #define SHT_MIPS_DEBUG          0x70000005
122 #define SHT_MIPS_REGINFO        0x70000006
123 #define SHT_MIPS_PACKAGE        0x70000007
124 #define SHT_MIPS_PACKSYM        0x70000008
125 #define SHT_MIPS_RELD           0x70000009
126 #define SHT_MIPS_IFACE          0x7000000b
127 #define SHT_MIPS_CONTENT        0x7000000c
128 #define SHT_MIPS_OPTIONS        0x7000000d
129 #define SHT_MIPS_SHDR           0x70000010
130 #define SHT_MIPS_FDESC          0x70000011
131 #define SHT_MIPS_EXTSYM         0x70000012
132 #define SHT_MIPS_DENSE          0x70000013
133 #define SHT_MIPS_PDESC          0x70000014
134 #define SHT_MIPS_LOCSYM         0x70000015
135 #define SHT_MIPS_AUXSYM         0x70000016
136 #define SHT_MIPS_OPTSYM         0x70000017
137 #define SHT_MIPS_LOCSTR         0x70000018
138 #define SHT_MIPS_LINE           0x70000019
139 #define SHT_MIPS_RFDESC         0x7000001a
140 #define SHT_MIPS_DELTASYM       0x7000001b
141 #define SHT_MIPS_DELTAINST      0x7000001c
142 #define SHT_MIPS_DELTACLASS     0x7000001d
143 #define SHT_MIPS_DWARF          0x7000001e
144 #define SHT_MIPS_DELTADECL      0x7000001f
145 #define SHT_MIPS_SYMBOL_LIB     0x70000020
146 #define SHT_MIPS_EVENTS         0x70000021
147 #define SHT_MIPS_TRANSLATE      0x70000022
148 #define SHT_MIPS_PIXIE          0x70000023
149 #define SHT_MIPS_XLATE          0x70000024
150 #define SHT_MIPS_XLATE_DEBUG    0x70000025
151 #define SHT_MIPS_WHIRL          0x70000026
152 #define SHT_MIPS_EH_REGION      0x70000027
153 #define SHT_MIPS_XLATE_OLD      0x70000028
154 #define SHT_MIPS_PDR_EXCEPTION  0x70000029
155
156 #define SHF_MIPS_GPREL          0x10000000
157 #define SHF_MIPS_MERGE          0x20000000
158 #define SHF_MIPS_ADDR           0x40000000
159 #define SHF_MIPS_STRING         0x80000000
160 #define SHF_MIPS_NOSTRIP        0x08000000
161 #define SHF_MIPS_LOCAL          0x04000000
162 #define SHF_MIPS_NAMES          0x02000000
163 #define SHF_MIPS_NODUPES        0x01000000
164
165 #ifndef ELF_ARCH
166 /* ELF register definitions */
167 #define ELF_NGREG       45
168 #define ELF_NFPREG      33
169
170 typedef unsigned long elf_greg_t;
171 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
172
173 typedef double elf_fpreg_t;
174 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
175
176 #ifdef CONFIG_32BIT
177
178 /*
179  * This is used to ensure we don't load something for the wrong architecture.
180  */
181 #define elf_check_arch(hdr)                                             \
182 ({                                                                      \
183         int __res = 1;                                                  \
184         struct elfhdr *__h = (hdr);                                     \
185                                                                         \
186         if (__h->e_machine != EM_MIPS)                                  \
187                 __res = 0;                                              \
188         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
189                 __res = 0;                                              \
190         if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
191                 __res = 0;                                              \
192         if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
193             ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
194                 __res = 0;                                              \
195                                                                         \
196         __res;                                                          \
197 })
198
199 /*
200  * These are used to set parameters in the core dumps.
201  */
202 #define ELF_CLASS       ELFCLASS32
203
204 #endif /* CONFIG_32BIT */
205
206 #ifdef CONFIG_64BIT
207 /*
208  * This is used to ensure we don't load something for the wrong architecture.
209  */
210 #define elf_check_arch(hdr)                                             \
211 ({                                                                      \
212         int __res = 1;                                                  \
213         struct elfhdr *__h = (hdr);                                     \
214                                                                         \
215         if (__h->e_machine != EM_MIPS)                                  \
216                 __res = 0;                                              \
217         if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
218                 __res = 0;                                              \
219                                                                         \
220         __res;                                                          \
221 })
222
223 /*
224  * These are used to set parameters in the core dumps.
225  */
226 #define ELF_CLASS       ELFCLASS64
227
228 #endif /* CONFIG_64BIT */
229
230 /*
231  * These are used to set parameters in the core dumps.
232  */
233 #ifdef __MIPSEB__
234 #define ELF_DATA        ELFDATA2MSB
235 #elif defined(__MIPSEL__)
236 #define ELF_DATA        ELFDATA2LSB
237 #endif
238 #define ELF_ARCH        EM_MIPS
239
240 #endif /* !defined(ELF_ARCH) */
241
242 struct mips_abi;
243
244 extern struct mips_abi mips_abi;
245 extern struct mips_abi mips_abi_32;
246 extern struct mips_abi mips_abi_n32;
247
248 #ifdef CONFIG_32BIT
249
250 #define SET_PERSONALITY(ex)                                             \
251 do {                                                                    \
252         set_personality(PER_LINUX);                                     \
253                                                                         \
254         current->thread.abi = &mips_abi;                                \
255 } while (0)
256
257 #endif /* CONFIG_32BIT */
258
259 #ifdef CONFIG_64BIT
260
261 #ifdef CONFIG_MIPS32_N32
262 #define __SET_PERSONALITY32_N32()                                       \
263         do {                                                            \
264                 set_thread_flag(TIF_32BIT_ADDR);                        \
265                 current->thread.abi = &mips_abi_n32;                    \
266         } while (0)
267 #else
268 #define __SET_PERSONALITY32_N32()                                       \
269         do { } while (0)
270 #endif
271
272 #ifdef CONFIG_MIPS32_O32
273 #define __SET_PERSONALITY32_O32()                                       \
274         do {                                                            \
275                 set_thread_flag(TIF_32BIT_REGS);                        \
276                 set_thread_flag(TIF_32BIT_ADDR);                        \
277                 current->thread.abi = &mips_abi_32;                     \
278         } while (0)
279 #else
280 #define __SET_PERSONALITY32_O32()                                       \
281         do { } while (0)
282 #endif
283
284 #ifdef CONFIG_MIPS32_COMPAT
285 #define __SET_PERSONALITY32(ex)                                         \
286 do {                                                                    \
287         if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
288              ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
289                 __SET_PERSONALITY32_N32();                              \
290         else                                                            \
291                 __SET_PERSONALITY32_O32();                              \
292 } while (0)
293 #else
294 #define __SET_PERSONALITY32(ex) do { } while (0)
295 #endif
296
297 #define SET_PERSONALITY(ex)                                             \
298 do {                                                                    \
299         clear_thread_flag(TIF_32BIT_REGS);                              \
300         clear_thread_flag(TIF_32BIT_ADDR);                              \
301                                                                         \
302         if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
303                 __SET_PERSONALITY32(ex);                                \
304         else                                                            \
305                 current->thread.abi = &mips_abi;                        \
306                                                                         \
307         if (current->personality != PER_LINUX32)                        \
308                 set_personality(PER_LINUX);                             \
309 } while (0)
310
311 #endif /* CONFIG_64BIT */
312
313 struct pt_regs;
314 struct task_struct;
315
316 extern void elf_dump_regs(elf_greg_t *, struct pt_regs *regs);
317 extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
318 extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *);
319
320 #ifndef ELF_CORE_COPY_REGS
321 #define ELF_CORE_COPY_REGS(elf_regs, regs)                      \
322         elf_dump_regs((elf_greg_t *)&(elf_regs), regs);
323 #endif
324 #ifndef ELF_CORE_COPY_TASK_REGS
325 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
326 #endif
327 #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs)                   \
328         dump_task_fpu(tsk, elf_fpregs)
329
330 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
331
332 /* This yields a mask that user programs can use to figure out what
333    instruction set this cpu supports.  This could be done in userspace,
334    but it's not easy, and we've already done it here.  */
335
336 #define ELF_HWCAP       (0)
337
338 /*
339  * This yields a string that ld.so will use to load implementation
340  * specific libraries for optimization.  This is more specific in
341  * intent than poking at uname or /proc/cpuinfo.
342  */
343
344 #define ELF_PLATFORM  __elf_platform
345 extern const char *__elf_platform;
346
347 /*
348  * See comments in asm-alpha/elf.h, this is the same thing
349  * on the MIPS.
350  */
351 #define ELF_PLAT_INIT(_r, load_addr)    do { \
352         _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
353         _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
354         _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
355         _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
356         _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
357         _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
358         _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
359         _r->regs[30] = _r->regs[31] = 0;                                \
360 } while (0)
361
362 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
363    use of this is to invoke "./ld.so someprog" to test out a new version of
364    the loader.  We need to make sure that it is out of the way of the program
365    that it will "exec", and that there is sufficient room for the brk.  */
366
367 #ifndef ELF_ET_DYN_BASE
368 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
369 #endif
370
371 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
372 struct linux_binprm;
373 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
374                                        int uses_interp);
375
376 struct mm_struct;
377 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
378 #define arch_randomize_brk arch_randomize_brk
379
380 #endif /* _ASM_ELF_H */